Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces

Xintong Zhang, Ming Jin, Zhaoyue Liu, Shunsuke Nishimoto, Hidenori Saito, Taketoshi Murakami, Akira Fujishima

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

We present here a facile method for the preparation of TiO 2-based superhydrophobic surfaces. It consists of two steps: (1) roughening of the TiO2 surface with a rf (radio frequency) plasma with CF4 as an etchant and (2) modification of the roughened TiO 2 surface with an octadodecylphosphonic acid (ODP) monolayer. Plasma etching caused the thinning of the TiO2 film but at the same time enhanced its surface roughness. A discontinuous wedgelike surface microtexture was formed after etching for 30 s, which, after modification with a monolayer of ODP, showed Cassie-type water super-repellency with a contact angle (CA) hysteresis smaller than 2°. The state of water super-repellency (water CA > 165°) could be converted to the state of superhydrophilicity (water CA ∼0°) by means of ultraviolet (UV) illumination as a result of the photocatalytic decomposition of the ODP monolayer by TiO2. Readsorption of ODP molecules leads directly to the recovery of water super-repellency.

Original languageEnglish
Pages (from-to)9477-9479
Number of pages3
JournalLangmuir
Volume22
Issue number23
DOIs
Publication statusPublished - Nov 7 2006
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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  • Cite this

    Zhang, X., Jin, M., Liu, Z., Nishimoto, S., Saito, H., Murakami, T., & Fujishima, A. (2006). Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces. Langmuir, 22(23), 9477-9479. https://doi.org/10.1021/la0618869